Pentax 645Z vs Sony A900
49 Imaging
79 Features
74 Overall
77
54 Imaging
66 Features
62 Overall
64
Pentax 645Z vs Sony A900 Key Specs
(Full Review)
- 51MP - Medium format Sensor
- 3.2" Tilting Screen
- ISO 100 - 204800
- No Anti-Alias Filter
- 1920 x 1080 video
- Pentax 645AF2 Mount
- 1550g - 156 x 117 x 123mm
- Announced April 2014
- Earlier Model is Pentax 645D
(Full Review)
- 25MP - Full frame Sensor
- 3" Fixed Display
- ISO 100 - 6400
- Sensor based Image Stabilization
- 1/8000s Max Shutter
- No Video
- Sony/Minolta Alpha Mount
- 895g - 156 x 117 x 82mm
- Released October 2008
- Newer Model is Sony A99
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Below, we are evaluating the Pentax 645Z vs Sony A900, one is a Pro DSLR and the other is a Advanced DSLR by competitors Pentax and Sony. There is a big difference among the image resolutions of the 645Z (51MP) and A900 (25MP) and the 645Z (Medium format) and A900 (Full frame) possess totally different sensor sizes.
Samsung Releases Faster Versions of EVO MicroSD CardsThe 645Z was released 5 years after the A900 which is a fairly big gap as far as camera tech is concerned. Both the cameras come with different body type with the Pentax 645Z being a Large SLR camera and the Sony A900 being a Mid-size SLR camera.
Before going straight into a complete comparison, below is a short view of how the 645Z matches up versus the A900 in relation to portability, imaging, features and an overall score.
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Following is a sample of the gallery pics for Pentax 645Z and Sony Alpha DSLR-A900. The complete galleries are provided at Pentax 645Z Gallery and Sony A900 Gallery.
Reasons to pick Pentax 645Z over the Sony A900
| 645Z | A900 | |||
|---|---|---|---|---|
| Released | April 2014 |  | October 2008 | More modern by 67 months |
| Display type | Tilting |  | Fixed | Tilting display |
| Display dimension | 3.2" |  | 3" | Larger display (+0.2") |
| Display resolution | 1037k |  | 922k | Sharper display (+115k dot) |
Reasons to pick Sony A900 over the Pentax 645Z
| A900 | 645Z |
|---|
Common features in the Pentax 645Z and Sony A900
| 645Z | A900 | |||
|---|---|---|---|---|
| Focus manually |  | Very exact focusing | ||
| Selfie screen |  | Neither offers selfie screen | ||
| Touch display |  | Neither offers Touch display |
Pentax 645Z vs Sony A900 Physical Comparison
If you're aiming to carry around your camera, you need to factor in its weight and proportions. The Pentax 645Z offers exterior measurements of 156mm x 117mm x 123mm (6.1" x 4.6" x 4.8") having a weight of 1550 grams (3.42 lbs) and the Sony A900 has measurements of 156mm x 117mm x 82mm (6.1" x 4.6" x 3.2") having a weight of 895 grams (1.97 lbs).
Look at the Pentax 645Z vs Sony A900 in the new Camera with Lens Size Comparison Tool.
Take into consideration, the weight of an Interchangeable Lens Camera will change dependant on the lens you use at that time. Below is the front view sizing comparison of the 645Z against the A900.
Using size and weight, the portability grade of the 645Z and A900 is 49 and 54 respectively.
Pentax 645Z vs Sony A900 Sensor Comparison
Oftentimes, its difficult to visualise the gap in sensor sizes simply by checking out technical specs. The image here might provide you a greater sense of the sensor measurements in the 645Z and A900.
As you have seen, the two cameras posses different megapixels and different sensor sizes. The 645Z because of its larger sensor will make achieving shallower depth of field less difficult and the Pentax 645Z will show extra detail as a result of its extra 26MP. Greater resolution can also enable you to crop photos somewhat more aggressively. The more modern 645Z will have an edge with regard to sensor innovation.
Pentax 645Z vs Sony A900 Screen and ViewFinder
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Pentax 645Z vs Sony A900 Specifications
| Pentax 645Z | Sony Alpha DSLR-A900 | |
|---|---|---|
| General Information | ||
| Make | Pentax | Sony |
| Model type | Pentax 645Z | Sony Alpha DSLR-A900 |
| Type | Pro DSLR | Advanced DSLR |
| Announced | 2014-04-15 | 2008-10-22 |
| Physical type | Large SLR | Mid-size SLR |
| Sensor Information | ||
| Powered by | PRIME III | Bionz |
| Sensor type | CMOS | CMOS |
| Sensor size | Medium format | Full frame |
| Sensor dimensions | 44 x 33mm | 35.9 x 24mm |
| Sensor area | 1,452.0mm² | 861.6mm² |
| Sensor resolution | 51 megapixel | 25 megapixel |
| Anti alias filter | ||
| Aspect ratio | 4:3 | 3:2 and 16:9 |
| Highest resolution | 8256 x 6192 | 6048 x 4032 |
| Highest native ISO | 204800 | 6400 |
| Lowest native ISO | 100 | 100 |
| RAW files | ||
| Autofocusing | ||
| Manual focusing | ||
| Touch focus | ||
| Continuous autofocus | ||
| Single autofocus | ||
| Tracking autofocus | ||
| Selective autofocus | ||
| Autofocus center weighted | ||
| Autofocus multi area | ||
| Autofocus live view | ||
| Face detection autofocus | ||
| Contract detection autofocus | ||
| Phase detection autofocus | ||
| Total focus points | 27 | 9 |
| Lens | ||
| Lens mount type | Pentax 645AF2 | Sony/Minolta Alpha |
| Number of lenses | 6 | 143 |
| Crop factor | 0.8 | 1 |
| Screen | ||
| Screen type | Tilting | Fixed Type |
| Screen sizing | 3.2 inches | 3 inches |
| Screen resolution | 1,037k dots | 922k dots |
| Selfie friendly | ||
| Liveview | ||
| Touch functionality | ||
| Screen technology | - | TFT Xtra Fine color LCD |
| Viewfinder Information | ||
| Viewfinder | Optical (pentaprism) | Optical (pentaprism) |
| Viewfinder coverage | 98 percent | 100 percent |
| Viewfinder magnification | 0.85x | 0.74x |
| Features | ||
| Slowest shutter speed | 30 secs | 30 secs |
| Maximum shutter speed | 1/4000 secs | 1/8000 secs |
| Continuous shooting rate | 3.0fps | 5.0fps |
| Shutter priority | ||
| Aperture priority | ||
| Manually set exposure | ||
| Exposure compensation | Yes | Yes |
| Set white balance | ||
| Image stabilization | ||
| Integrated flash | ||
| Flash distance | no built-in flash | no built-in flash |
| Flash settings | Flash On, Flash On+Red-eye Reduction, Slow-speed Sync, Slow-speed Sync+Red-eye, P-TTL, Trailing Curtain Sync, contrast-control-sync, high-speed sync, wireless sync | Auto, On, Off, Red-Eye, Slow Sync, Rear Curtain, Fill-in, Wireless |
| External flash | ||
| AE bracketing | ||
| White balance bracketing | ||
| Maximum flash synchronize | 1/125 secs | 1/250 secs |
| Exposure | ||
| Multisegment metering | ||
| Average metering | ||
| Spot metering | ||
| Partial metering | ||
| AF area metering | ||
| Center weighted metering | ||
| Video features | ||
| Supported video resolutions | 1920 x 1080 (60i, 50i, 30p, 25p, 24p), 1280 x 720 (60p, 50p, 30p, 25p,24p) | - |
| Highest video resolution | 1920x1080 | None |
| Video format | MPEG-4, H.264 | - |
| Mic support | ||
| Headphone support | ||
| Connectivity | ||
| Wireless | None | None |
| Bluetooth | ||
| NFC | ||
| HDMI | ||
| USB | USB 3.0 (5 GBit/sec) | USB 2.0 (480 Mbit/sec) |
| GPS | Optional | None |
| Physical | ||
| Environment sealing | ||
| Water proofing | ||
| Dust proofing | ||
| Shock proofing | ||
| Crush proofing | ||
| Freeze proofing | ||
| Weight | 1550 grams (3.42 lbs) | 895 grams (1.97 lbs) |
| Dimensions | 156 x 117 x 123mm (6.1" x 4.6" x 4.8") | 156 x 117 x 82mm (6.1" x 4.6" x 3.2") |
| DXO scores | ||
| DXO All around rating | 101 | 79 |
| DXO Color Depth rating | 26.0 | 23.7 |
| DXO Dynamic range rating | 14.7 | 12.3 |
| DXO Low light rating | 4505 | 1431 |
| Other | ||
| Battery life | 650 shots | 880 shots |
| Battery style | Battery Pack | Battery Pack |
| Battery ID | D-LI90 | NP-FM500H |
| Self timer | Yes (2 or 10 secs) | Yes (2 or 10 sec) |
| Time lapse recording | ||
| Storage type | Dual SD/SDHC/SDXC slots | Compact Flash (Type I or II), Memory Stick Duo / Pro Duo, UDMA Mode 5, Supports FAT12 / FAT16 / FAT32 |
| Card slots | Two | Two |
| Price at launch | $5,024 | $2,736 |